Scale lever system



Aug. 27, 1940. B. w. KING SCALE LEVER SYSTEM Filed Deo. 9, 1938 4 Sheets-Sheet l INVENTOR. Be rt (A). K 'i n 3 N um E. mm,

Aug. 27, 1940. I B. w, KING SCALE LEVER SYSTEM 4 sheets-sheet 2 Filed Dec. 9, 1938 INVENTOR. Be rt La). K in g @ma ATTORNEYS Aug. 27, 1940. B. w. Km@ 2,212,742

SCALE LEVER SYSTEM Filed Deo. 9, 1938 4 Sheets-Sheet 3 36 45 O fb Z4 n il O I \/-25 m Z6 2f Il Y A INVENTOR.

ATTORNEYS Aug. 27, 1940. B. w. KING SCALE LEVER SYSTEM Filed Dec. 9, 1938 4 Sheets-Sheet 4 J m mm m Vi MH A r G nu Patented Aug. 27, 1940 s 1P'il''lirlvrlf foFFICE scam Leven srsfrranvr inert' king, Detroit, inh. .applicaamnemper s, 1938, Nn. 244,179-

inventionrelates to ai system of levers for scales and it has todo 'particularly with a lever Asystem for scales used in retailfstores or-the like where accuracy is demanded. The lever system is, of course, not limited to use with` such scales.

Among the objects of the invention islthe profvision of anoveL-'simpliied lever system,1which facilitates initial correct adjustment of the scale 'and 'which'is so constructed that such initial adio ljunxnem; -wi11 be'maintained. Ar'further objectis to Vprov'idealever structure requires very little vertical space, with the result that the plat- -form of a scale may be located relatively low as compared tothe 'surface of the counter or 'other 5 support upon `whic'zh the-scale rests. There are details cih-novelty, and. these details, together with other objects will become appreciatedas the detailed description is considered.

-Fig. l isa 'view'illustrating the lever system in side elevation and showing some other parts of the scale ln section.- 1- Fig.- 2 is'a view similar to Fig. l. taken on section line -2--2of Fig.3 showing the levers swung upwardly van abnormal amount in order to'better show underlying structure. Fig. 3 is a top plan view of the load receiver and lever system. f

Fig. 4 isan end view of the'l'ever--system look- -ing substantially on line 4-4 of Fig. 3.

Fig. 5 is a sectional view taken substantially on line 5-5 ofFig. 3.

Fig. 6 is a perspective view of the load receiver. Fig. 7 is a perspective view of a sublever of the system.

Fig. 8 is a The base of a scale housing is illustrated at I, the base having a cover portion'2 overlying the levers, and a portion of a post "is illustrated at 3. A load-receiving platform 4 is mounted on posts 5 which extend through apertures in the housing Zand are supported lby the load-receiver. A steelyard is shown at 6 pivotallyfconnected as at `I to a terminal 'piece 8 having an inverted agate bearing 9 which supportsthe lever. A dash pot takes the form .of a cylinder III in which 'is a 'piston (not shown) while a pistonr'od Il is con-- nected as at I2 to anarm I3 secured to the terminal piece 8. A part I4 covers the connection I2.

c The main lever is villustrated. at 20 and it is of frame structure and has a knife-edge'bearing I5 at its projecting small'end which seats in the agate bearing. It is rather common to refer to bearings of the type shown as agate bearings, since the V-block is made of agate. However,

perspective view of the main lever.

-bearing members 22. i

henceforth, such bearings V-bearings. f'The main lever is provided with double knifeed'g bearings 2| at one end and double kniferedge bearings -22 in an intermediate portion, and 5 upstandingiknife-edge bearing 23 located mid- 'way between the bearings 2I and 22. The double knlfe-edge'bearings 2I are pivotally mounted in 'V-bearing blocks 24 Acarried by supports 25 and "are held down by links v26 with inverted V-bearl0 -ix' 1g"s"2`I.-' 'Ifhus it willbe seen that the main lever ispivoted at one end with double knife-edge bearjings and has a single knife-edge bearing at its cppesiteend with the 'steelyard :A sublever 30 (Fig. '1) hasspaced knife-edge 115 bearings ,3I atA one end, a downwardly directed knife-edge bearing 32 in its intermediate portion', and an upwardly directed knife-edge bearling 33 at it'sfopposite end. The knife-edge bearings 3Irrest upon the top of studs 34. A push link 20 l35 with oppositely disposed V-bearings is disposed between the knife-edge bearings 32 and 23 to transferl the load from the sublever to the Amain lever. As shown in Fig. 3, the piece forming the knife-edge 32 and the piece forming the F25 knife-edge 23 are loosely connected by bolts 36 -to keep the levers from separating, although these bolts perform no function in the weighing operation.

A load receiver 40 shown in Fig. 6 has apar-3o tures 4I for receiving the posts 5 and it is equipped with spaced inverted V-bearings 42 near one end. The opposite end has downwardly prov jecting brackets 43 which carry an inverted knife-edge bearing 44. The V-bearings 42 resti-35 upon the outwardly projecting portions of the knife-edge bearings 22. Links 45 depend from Vprojections 46 and have V-bearing blocks engaging under the inwardly extending knife-edge will be referred to as -A"40 A link 50 has a V-bearing block 5I engaging the knife-edge 33 on the sublever and a V- bearing 52 engaging under the knife-edge 44 on the loa-:7. receiver.

The member with the knife-edges 3l of the 45 sublever has an intermediate knife-edge 55 facing upwardly and a bracket 56 carries an inverted V-bearing 51 which engages over the knife edge 55, thus holding the knife-edges 3I on the studs 34.

It will thus be observed that the main lever has a double knife-edge bearing at its pivoted end with the double knife-edge serving as the main fulcrum, so to speak, and serving to hold 'this end of the lever down in position; but the.;.55

main lever has a single bearing with a steelyard at its opposite end. The load carrier has a double knife-edge bearing on an intermediate portion of the main lever and a single connection at its 5 opposite end with the sublever comprising the link 50 and knife-edges 33 and 44 at the opposite end. The push link or strut 35 supports the sublever from the main lever. Thus all the load is transferred to the main lever;

l When the subleveris in a horizontal position its knife-edge 33 isjin alignment with theknfeedges 2|. In this position the knife edges 22 are in alignment vwith the knife edges 3|. ably the scale operates over this intermediate po-- unloaded the angularity of the sublever relative to the horizontal is about the saine as it is under full load but on opposite sides ofa horizontal line. Fig. 3 shows about the normal unloaded position. 20 In the actuation of the main lever, th load supzporting1knife-edges 22; move 1 inf an arc 4.around the knife-edge bearings 2|. 'I'he distance ,be- Ytween fthe 'knife-edges 3| and 33 lon thesublever .fthe same. as :the distance .between the knife- 25 ledgesi22land-2I` on the-main lever'. f' In the actuation Aof -the leverv systempknife-edge y33 moves Vin lva'ncarc ,around the. knife-edge,.bearings 3 l. The :loa-dci .carrier-, thereiore, shifts laterally .correj'spon'ding to. the arcuatemovement, of :the knife- 130 edges 22, but the link 5||.which carries the load at zthc: opposite-iendfof thegcarrier: rrocks to permit -thisi'movementil -Thefbearings v23fand 32 are disl`posed mid-way,-.l respectively, between the bearings 2| and 22 on the main lever and 3| and 33 t3'5 `on the -subleverfandtherefore the longitudinal compound'- of the, arcuate movementI amounts rto -only half-thatof. the knife-edgebearings 22 and 'knifeedge bearing.- 33,; ,but the, arcuate move- -mentsia're in fthe opposite direction. yThese oprpositeiyarcs, however; Aare small,4 and therefore --the strut 35 can be short, I-thus making for a low lever structure, and low platform position. y d i., The sublever shown herein is an even leverin -thatit has no multiplying action; that is to say, :Ms-the distances from the center knife-edge i32 to :theknifeedges 3| andL33 are equal. -The sub- :lever has singlegcenter/ line connections-,for the '.zload, namely, at the single center bearings-32 and 33. 'Ihese are in line with each other on thecen- 150 -ter of= the :lever and thisv makes it much .easier rito properly assemble and adjust the scale, since laterally .spacedl connections introduce possible -errors andintroduce the possibility of variation after. initial installation. The sublever, 'in ef- ?.55 fe'ct, has three bearings, all in a row lengthwise thereof, and all center line bearings. This likewise centralizes the stressed loadthrough a single line in the sublever. s. 'Another point-fof importance is the fact that (d0 the steelyard has a single connection to the main lever;y accordingly, 4the steelyard may shift or "wobble, so to speak, in any direction, and this .is particularly advantageous in a low scale structure. This has been accomplished by disposing 65 "the dash pot oi center, or in other words, out of the line of forces.' r'I'his may introduce some torque on the steelyard .as the levers function, but when they come to rest there is no torque. The lever-Y system shown herein is arranged (70 so that the length of the lever arms of the main llever andfthesublever is equal. In other words, the .distance on the sublever between bearings 32 and 3| is the same as the distance between 32 and 33; and these distances are the same as the 75: distancebetweenbearings 23 and 22 andbearings 23 and 2| on the main lever. However, the lever system may not be of this so-called even type. To exemplify what is meant, the distance from bearings 2| to 22 on the main lever may be considered as M and the distance from bearings 2| to 23 on the main lever considered as X; the distance between bearings 33 and 3| on the sublever may be considered S, while the distance on the sublever from 32 to 3| considered Y. Now the lengths of the various lever arms may be l`.varied yas desired, so long as a denite relation is maintained, and this relation is as follows: ,X:M::Y:S. In other words, the relation bemtween the portion X of the main lever and the sition in its normal function; that is tovsay,"whenf distance between the load supporting bearings of l5 the main lever must be the same as the relation of the' portion Y of the sublever is to the length ,.'of the sublever between its end bearings.

In some of the claims appended hereto it is stated that some of the bearings are of the lfixed-type, This language is used to define beargings offsucha xed nature that the load re- ,.ceivershifts with the arcuate movement of the ,bearing on .the lever as distinguished from a `loadfsupp0rif-of the pivoted link or strut type.

- 1I claim: 51..Ascale lever system comprising, a main lever, a double knife-edge bearing at one end of .,the: main lever and forminga fulcrum, a steel- Yardconnection at the opposite end of the main 3,0 -lever,a1lo ad receiver, a double knife-edge bearing Ao igthexed type between one end of the load `receiver andan intermediate portion lof the main -leverfla sublever, a fulcrum bearing at one end f :of the ysublever, a load bearing at the other end 35 of-.vthe sublever, a link connection between the load receiver and the `load bearing of the sublever, and a push link between the sublever and .fmainulever kand-.operating on bearings on the ,main-,lever and sublever located so Athat the distance between the push link and the fulcrum of the mainleyer relative to the distance fromthe efulcrnumpto the load bearing on the main lever -A is the same as the distance from the push link to the fulcrum of the sublever is vto the distance 45 from the fulcrum to the load bearing of the sublever.

-2. A Vscaleflever system comprising, a main lever, a double knife-edge bearing at one end of -the mainleverand forming a fulcrum, a steel-,50

yard connection at the opposite end of the main lever, a load receiver, a double knife-edge bearing of the xedtype between one end of the load receiver and an intermediate portion of the main leverfa sublever, a fulcrum bearing at one end,l 55 of thesublever, -a load bearing at the other end` v,of the sublever, 'a link connection between the load receivertand the load bearing of the sublever, and a push link between the sublever and -main lever and Aoperating on bearings on the, main. lever and sublever located so that the disy tance betweenthepush link and the fulcrum of the main, lever` relative to the distance from the ffulcrum to the. load bearing on the main lever is the sameas the distance from the push link to 65 "the fuie'rum vof the sublever is to the distance' from the fulci'um to the load bearing of the sublever, said sublever being located substantially on a centerline of thev main lever, and the iulcrum bearing, load'bearing and push link bearing on 70 the'sublever'being disposed in alignment substantiallyr on the center of the sublever.

3.'=A :scale lever system comprising, a main lever'having laterally spaced double knife-edge 4bearings atone end constituting a fulcrum, a 75 t steelyard connection at the opposite end of the main lever, laterally spaced double knife-edge bearings on the main lever disposed in its intermediate portion,` a sublever, a fulcrum bearing for -one end of the sublever positioned adjacent -the double knife-edge bearings in the intermetween the Afulcrum bearing and loadv bearing on the sublever being the same, a load receiver having one end carried by laterally spaced knifeedge bearings in the intermediate portion of the main bearing, a load carrying link supporting the other end of the load receiver on the load bearing of the sublever, anda push link having a pivotal connection with the main lever on a center c line between the fulcrum bearings Vand the intermediate bearings and having a pivotal connection with the sublever on a center line between the fulcrum bearing and load bearing of the sublever. f

4. A scale lever system comprising, a main lever having laterally spaced double knife-edge bearings at one end constituting a fulcrum, a single knife-edge bearing at the opposite end of the main lever located on a center line between thespaced knife-edge bearings for connection to a steelyard, laterally spaced double knife-edge bearings on the main lever disposed in its intermediate portion, a sublever, a fulcrum bearing for one end of the sublever positioned adjacent the double knife-edge bearings in the intermediate portion of the main lever, a load bearing at the opposite end of the sublever, a load receiver having one end carried by laterally spaced knife-edge bearings in the intermediate portion of the main bearing, a load carrying link supporting the other end of the load rev ceiver on the load bearing of the sublever, and a push link having a pivotal connection with ythe main lever on a center line between the fulcrum bearings and the intermediate bearings and having a pivotal connection with the sublever on a center line between the fulcrum bearing and load bearing of the sublever;

5.A scale lever system comprising, a, main lever having laterally spaced double knife-edge bearings at one end constituting ak fulcrum, a steelyard connection at the opposite end of the main lever, laterally spaced double knife-edge bearings on the main lever disposed in its intermediate portion, a sublever, a. fulcrum bearing for one end of the sublever positioned adjacent the double knife-edge bearings in the intermediate portion of the main lever, a load bearing at the opposite end of the sublever, a load receiver having one end carried by laterally spaced knife-edge bearings in the intermediate portion of the main bearing, a load carrying link supporting the other end of the load receiver on the load bearing of the sublever, an upwardly disposed knife-edge bearing on the main lever disposed on its longitudinal center line, a downwardly disposed knife-edge` bearing on the sublever, the load bearing and last mentioned knife- `edge bearing on the sublever being disposed on the longitudinal center lmeyof the sublever; and v a push link havingl oppositely disposed V-bear- -ings cooperating with the last mentioned knife- `edge bearings on the main lever and sublever so that the distance between the push link and the fulcrum of the main lever relative to the distance from the fulcrum to the load bearing. on the main lever is the same as the distance from the push link to the fulcrum of the sublever is to the distance from `the fulcrum to the load bearing of the sublever.

6. A scale lever system comprising, a main lever, laterally spaced double knife-edge bearings at one end of the lever, bearings therefor providing a fulcrum, links cooperating therewith serving as hold-down elements, a single knifeedge bearing on the longitudinal center line of the lever and at the opposite end thereof for a steelyard connection,laterally spaced intermediate double knife-edge bearings on the main lever, a carrier with V-bearings mounted upon the intermediate knife-edge bearings and having links cooperating with the intermediate double knife-edge bearings and serving as hold-down elements, a single knife-edge bearing on the main lever disposed on its longitudinal center line half way between the fulcrum bearings and load receiver bearings, a sublever, knife-edge bearings at one end thereof constituting a fulcrum, a knife-edge bearing at the other end constituting a load bearing, a,v single knife-edge lbearing half way between the fulcrum bearing vand load bearing on the sublever withthe load bearing and said single knife-edge bearing' disposed on the longitudinal center line of the sublever, a knife-edge bearing at one end of lthe load receiver, a link connecting the last mentioned knife-edge` bearing and the load bearing of the sublever, said sublever being located on the longitudinal center line of the main lever, and a push link having oppositely disposed V-bearings cooperating with the said single knife-edge bearings and the main lever and sublever, the distance between the fulcrum andload bearings of the sublever being the same as the distance between the fulcrum and intermediate double knife-edge bearings of the main lever 7. A scale lever system comprising, a main lever, a bearing' at one end of the main lever and forming a fulcrum, a steelyard connection at the opposite end of the main lever, a load receiver, a bearing offthe xedtype between one end of the load receiver and an intermediate portion of the main lever, a sublever, a fulcrum bearing at one end of the sublever, a load bearing at-the other end of the sublever, a link connection between the load receiver and the load bearing of the sublever, and a push link between the sublever and main lever and operating on bearings on the main lever and sublever located so that the distance between the push link and the fulcrum of the main lever relative to the distance from the fulcrum to the load bearing on the main lever is the same as the distance from 

